Method of making roof ventilator



Feb. 9, 1965 G. M. BREIDERT 3,168,780

METHOD OF MAKING ROOF VENTILATOR Filed Nov. 26, 1962 .2 a 5 650/2 5 M.BPE/DEQ 7' IN VEN TOR.

ATTOQNEYS United States Patent 3,168,7dtl MEIR-ill) @h MAKENG R091VENTILATGR George M. 'Ereidert, Granada Hills, tlmiii, assignor to TheG. C. Breidert Co., San Fernando, Calii, a corporation of CaliforniaFiled Nov. 26, 1962, Ser. No. 2%,tl85 1 Ctaim. (Cl. 29-455) Thisinvention has to do with the art of roof ventilators and relates moreparticularly to a novel method of making a roof ventilator. Thisapplication is a continuation in part of my copending application,Serial No. 64,864, filed October 25, 1960, now abandoned.

Conventional roof ventilators consist of a relatively large number ofparts which must be separately manufactured and, therefore, for theirmanufacture, many different dies are required, which renders then1anufacturing costs rather high.

It is therefore an object of my present invention to provide a method ofmanufacturing a roof ventilator which method requires a minimum numberof parts and dies and which therefore substantially reduces themanufacturing costs, enabling the ventilator to be sold at a relativelylow price.

Other objects and advantages will appear hereinafter.

While I shall point out in the appended claim the method which I believeto be new, I shall now, by way of example, explain in detail mypresently preferred method, for which purpose I shall refer to theaccompanying drawing, wherein:

FIG. 1 is a side elevational view of a ventilator embodying myinvention;

FIG. 2 is an enlarged view, like FIG. 1, except that some parts areshown in section and some are shown in elevation;

FIG. 3 is a sectional view illustrating one step of my method;

FIG, 4 is a sectional view illustrating other steps of my method; and

FIG. 5 is a sectional view illustrating another step of my method.

The end product of my method is a roof ventilator generally denoted inthe accompanying drawing by the numeral 5, comprising a base or bottomportion 6, a top portion 7, a surrounding baffle member 8 ofconcavoconvex cross section, and bolts 15 and spacer sleeves 17 forretaining the upper and lower parts in vertically spaced relationshipand for securing the annular baflle member in spaced surroundingrelationship to the upper and lower portions of the ventilator.

It will be noted that the bottom or base 6 has a dishshaped portion 6a,an annular neck portion 612 and a curved transitional portion 60, whilethe upper portion 7 has an inverted dish shape presenting a frustoconical side portion 70 and a flat top portion 712.

The annular battle member is composed of a lower half 80 and an upperhalf 812, each of which halves, in cross section, is generally concavoconvex, and has a radially outwardly disposed edge flange 8c. Theflanges 8c are secured together, as by welding, to form an annular bead19.

The equidistantly spaced bolts 15 extend through corresponding holes inbafile portions 8a and 3b, through portions 6 and 7, and through spacersleeves 17 interposed between the bafile portions and the lower and upper portions 6 and 7. Consequently the bolts and spacer sleeves not onlymaintain the lower and upper portions 6 and '7 in vertically spacedrelationship to provide an air outlet 20 between their peripheralportions, but also maintain the baffle member 8 in radially spacedrelationship to the portions 6 and '7 whereby to provide an airpassageway 20a.

The peripheral portions of each of the lower and upper positions 6 and 7terminates in a downturned bat'lle flange in use, the neck 6b is placedin communication with an air outlet duct of a building or the likeextending through the building roof and winds passing around theventilator as well as between the battle 8 and the upper and lowerportions 6, 7 siphon air from the building through outlet 20.

My method of making the ventilator is as follows:

I first form, as by conventional stamping or spinning, two duplicateparts 7 as shown in FIG. 3. In the finished ventilator one of thoseparts constitutes the upper part 7 of the ventilator, and the otherpart, after slight alteration as will be described, eventually forms thelower part of the ventilator. I also form, by conventional stamping orspinning, two duplicate annular parts 8a, Sb of concavo convex crosssection, which parts are thereafter assembled as will be hereinafterdescribed, to form the bafile member 8.

I then, as shown in FIG. 3, cut out the central portion 7b of one of theformed parts 7, which I do by any suitable well known cutting tool,leaving an opening 11 (FIG. 4) in said part. Next I form, as byspinning, the conoidal portion into a cylindrical neck 61) as shown bythe broken lines in FIG. 4. When one of those parts 7 is thus altered,it becomes as shown in FIG. 5 and constitutes the lower portion 6 of thefinished ventilator.

After thus forming the duplicate part 7, altering one of those parts asdescribed, and after thus forming the duplicate parts and 30 asdescribed, I assemble the duplicate parts 8b and 8c together by weldingthe flanges 8c together and secure the thus formed bafile member to thethus formed parts 6 and 7 by means of the bolts 15 and spacer sleeves17, and the ventilator is then in assembled condition ready forinstallation. It will be seen therefore that my method requires only onedie for forming the duplicate parts 7 and one die for forming theduplicate parts 8a and 812.

I claim:

The method of making a roof ventilator which comprises the steps of:

(a) Forming two duplicate dish-shaped members,

(b) removing the medial portion of one of said members whereby toprovide a central opening therethrough,

(c) forming the part of said last mentioned member bounding said openinginto a cylindrical shape,

(d) forming two duplicate annular elements of concavo-convex crosssection, each having a radially disposed annular edge flange,

(e) securing said flanges together whereby to form said annular elementsinto a single 'bafiie member of substantially concavo-convexcross-section,

(f) arranging said first mentioned members in vertically spaced, opposedrelationship whereby to provide an air outlet therebetween,

(g) arranging said baffle member in radially spaced surroundingrelationship to said first mentioned members, whereby to provide an airpassageway therebetween, and

(h) securing said members in said relationship.

References Cited in the file of this patent UNITED STATES PATENTS174,304 Robinson Feb. 29, 1876 509,593 Brown Nov. 28, 1893 637,863 GavinNov. 28, 1899 1,966,713 Flint July 17, 1934 2,869,228 Martin Jan. 20,1959

